Slow Wifi with FW 3.1.0 on Google Fiber

I'm seeing a lot of these posts so I thought I'd chime in. I'm running Google Fiber with a Trendnet gigabit switch and Amplifi as my wireless router. I am getting up to 800Mbps via ethernet.

Wifi has been fine, but I'd noticed lag spikes in games to the point of disconnection in some cases. Speed tests on Wifi were coming back at 20/30Mbps max, and YouTube was playing back grainy and scaled down. I didn't think about it until this evening, but the changes were right around when I updated to 3.1.0. I changed all kinds of settings and made sure Hardware NAT was enabled.

I reset phones, laptops, etc. Tonight I made two changes: I downgraded to 3.0.1, and I enabled Router Steering. At the moment wifi is back to 140-160Mbps download while upload is still pretty slow (~30Mbps).

@Edward-Dolezal my mistake, the TrendNet is a switch. I did Google router -> bridge-mode Amplifi previously and have had MUCH better performance using the switch -> Amplifi router mode. I do not have a double NAT, and have had no issues with Xbox port forwarding.

Wifi is back to 20-60Mbps. My AppleTV 4 on Wifi doesn't have a speed test, but even YouTube is timing out to the point the navigation icons aren't loading. Again, 800-900Mbps on ethernet from Fiber Jack -> TrendNet -> Amplifi -> Macbook.

Still on 3.0.1. I have switched both 2.4 and 5 Ghz Wifi channels a few times with no change. I have tried 3 Macbooks and multiple speed tests.

This is pretty frustrating - no streaming services will function and we cuts cords a long time ago. Ok, I can enjoy the quiet. My work VPN won't connect (everything relies on wireless now, thanks Apple), so that's shot. I have one laptop that will connect via ethernet and it's a 2012 model.

I debated going full USG -> APs for a while and hoped that Amplifi would work for ease of setup - I already have a tech job and I don't want to come home and play Support. It has been great for a long time but this is basically a full outage.